The OpenFlow spec forbids multiple occurences of a same instruction type within a mod_flow message, so make sure ofp_instruction_from_jsondict doesn't emit such an instruction set. Signed-off-by: IWAMOTO Toshihiro <iwamoto@valinux.co.jp> Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>